Diagnostic Functions

Diagnostic functions

General
The Closing velocity module (CVM) checks performed activations, input and output signals as well as functions through built-in diagnostics.

Diagnostic trouble codes (DTCs)
A diagnostic trouble code (DTC) is stored if, after validation, the control module detects a fault. In certain cases the faulty signal is also replaced with a substitute value or certain functions are limited.

Reading and erasing diagnostic trouble codes (DTCs)
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.
Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.

Note! Certain functions are unavailable until the diagnostic trouble codes (DTCs) have been erased.

Reading off the parameters
This function is used to read the status or value of parameters. The status or value can be presented digitally.

Activating components and functions
This function can be used to activate components and functions that affect the Closing velocity module (CVM).

Reading off the control module identification
The diagnostic tool identifies control modules by reading off a number of codes from the control module memory.
The codes contain information about the control module:
- hardware P/N (control module without software)
- hardware serial number (control module without software)
- software P/N
- diagnostic software P/N.

Reading off extended fault-tracing information
This function can be used to read out parameters, identify status and counts stored at the same time as a diagnostic trouble code (known as frozen values).
For more information, see Vehicle communication information in Specifications, other.